It is an “open secret” last time that if you call the Singtel customer service hotline at 1688, they may give you a recontract voucher for you to get a new phone. In previous times it used to be as high as $100, then over the years it slowly reduced to $50. It seems that the voucher is gone now, for low usage customers (e.g. Combo 2 plan). That is, no more recontract voucher. That was my experience in September 2018. That being said, experiences may differ from user to user, you may still want to phone in to try your luck. The only reason I am still using Singtel is that the rest of my family is on the “Singtel Circle” plan.
Important Update: There is a new form of voucher, called the Singtel Referral Voucher, worth $100! Basically you switch to a new Combo Plan and get $100 off the phone.
Best Phone to Recontract and Sell Off
Traditionally, the best phone to recontract and sell has always been the latest iPhone. This is based on the strong demand for iPhone. For instance, as of now, the most popular seems to be iPhone XS, Gold color, 256 GB. Do take note of the color/storage size as unpopular combinations may fetch a lower price. At the time of writing, recontracting and selling an iPhone may earn as much as $300 or more (buy at $1338 and sell off at $1640).